Pengaruh Komposisi Polietilen Glikol (Peg) pada Membran Keramik Berpori dari Silika Fly Ash Batubara dengan Penambahan Pva (Polivinil Alkohol) untuk Filtrasi Air Mengandung Zat Warna Metilen Blue

Abstract

The use of membrane technology in waste treatment shifts the notion of "waste as cost" to "waste as profit". Membranes are widely used in industry for water filtration, food purification, biomedical development. Fly ash (fly ash) is one of the residual materials from fuel combustion in large quantities, so it requires processing so as not to cause environmental problems. Fly ash (fly ash) has a lot of silica content so that it has the potential as a matrix in the manufacture of membranes. In this study, silica was combined with polyvinyl alcohol (PVA) and polyethylene glycol (PEG) to form a Si/PEG/PVA membrane. This study aims to determine the effect of the addition of polyethylene glycol on the characteristics of the resulting Si/PEG/PVA membrane including selectivity to water and better mechanical properties. In this study, the synthesis of silica precipitate from coal fly ash was carried out in several stages, namely the processes of washing, extraction and precipitation with acid which were then characterized. The precipitate silica obtained will be used as a matrix on the ceramic membrane. The process of making ceramic membranes uses a press molding process with a combustion temperature of up to 700°C for 2.5 hours. The membrane was made by mixing silica precipitate as a matrix and polyethylene as a pore-forming agent with varying concentrations of 1%, 3%, 5% and 7% (w/v) polyethylene glycol, while 2% polyvinyl alcohol (PVA) was used as a binder (adhesive). which is then molded and dried at room temperature. The printed membrane was then tested for its physical and mechanical properties. The results of the characterization of precipitate silica using FTIR showed absorption peaks characteristic of the Si-OH and Si-O-Si groups from silica. The FTIR spectrum for Si/PEG/PVA ceramic membranes before combustion showed that there were still –OH groups from the hydroxyl group. wave 3384.92 cm-1 and widens at wave number 1640.0 cm-1. The results of the DSC thermogram showed that the 4:7:5% Si/PEG/PVA ceramic membrane after firing had lower thermal stability with the required heat around 180.57mJ or equivalent to 31.19mcal. The more pore-forming materials used, the more pores are formed. The results of the structure of the membrane pores seen using SEM, obtained irregular pores and the largest pores, namely ceramic membranes with a variation of 7% PEG by 72%. The selectivity test was carried out by calculating the reduction in ppm of methylene blue after passing through the ceramic membrane. A reduction in the concentration (ppm) of methylene blue was 2.74 ppm.